feat(assert): add assert_array_length#747
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Assert an array has exactly N elements. Includes a doc section (with the regenerated `bashunit doc` snapshot) and CHANGELOG entry. Closes #743
Expanding an empty array under set -u is an unbound-variable error on Bash 3.2; call assert_array_length with just the length instead.
Building a local array from "$@" is unreliable under Bash 3.0 strict mode; count via $# and display via $* instead (no array construction).
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Summary
Adds
assert_array_length <n> <array>— asserts an array has exactlynelements.Empty arrays are supported (
assert_array_length 0). Signature mirrors the existingassert_array_contains(count first, then expanded elements).Tests
test_successful_assert_array_lengthtest_successful_assert_array_length_with_empty_arraytest_unsuccessful_assert_array_lengthmake sa+make lintpass; targeted suite green (sequential + parallel +--strict --simple);bashunit docsnapshot regenerated.Docs:
docs/assertions.md. CHANGELOG updated under Unreleased → Added.Closes #743